function moveElement(elementID,final_x,final_y,interval) {//移动
    if(!document.getElementById) return false;
    if(!document.getElementById(elementID)) return false;
    var elem = document.getElementById(elementID);
    if(elem.movement) {
        clearTimeout(elem.movement)
    }
    if(!elem.style.left) {
        elem.style.left = "0px";
    }
    if(!elem.style.top) {
        elem.style.top = "0px";
    }
    var xpos = parseInt(elem.style.left);
    var ypos = parseInt(elem.style.top);
    var dist = 0;
    // console.log("a")
    if(xpos == final_x && ypos == final_y) {
        return true;
    }
    if(xpos < final_x) {
        dist = Math.ceil((final_x - xpos)/10);
        xpos += dist;
    }
    if(xpos > final_x) {
        dist = Math.ceil((xpos - final_x)/10);
        xpos -= dist;
    }
    if(ypos < final_y) {
        dist = Math.ceil((final_y - ypos)/10);
        ypos += dist;
    }
    if(ypos > final_y) {
        dist = Math.ceil((ypos - final_y)/10)
        ypos -= dist;
    }
    elem.style.left = xpos + "px";
    elem.style.top = ypos + "px";
    var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")";
    elem.movement = setTimeout(repeat,interval)
}